Upper Letts Lake Weather Forecast

    • 63
    • 74

    Sunny

    • 65
    • 76

    Mostly Sunny

    • 61
    • 73

    Partly Sunny

    • 60
    • 65

    Slight Chance Rain Showers

    • 61
    • 68

    Slight Chance Rain Showers

    • 62
    • 71

    Sunny

Today 16 Sep Mountains Southwestern Shasta County to Western Colusa County

Sunny. Highs 72 to 87 higher Elevations. 88 to 94 lower Elevations. Prevailing northwest Winds up to 10 Mph shifting to the southeast in the afternoon.

Tonight 16 Sep Mountains Southwestern Shasta County to Western Colusa County

Clear. Lows 56 to 70 higher Elevations. 64 to 72 lower Elevations. Prevailing south Winds up to 10 Mph shifting to the west after midnight.

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Upper Letts Lake Temperature Statistics

September Temperature

Ukiah Municipal Airport (28.6 miles)

  • Lowest 7 September, 2025

    50 °F

  • Average September

    69.3 °F

  • Highest 2 September, 2025

    102.9 °F

Climate (2020–Present)

Ukiah Municipal Airport (28.6 miles)

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  • Average Low 2020–2025

    46.8 °F

  • Average 2020–2025

    60.7 °F

  • Average High 2020–2025

    76.3 °F
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